Micrometer-gage attachment for lathes, &amp;c.



- PA'I'BNTED AUG. 8, 1905. W. A. PARRAR. MIGROMETER GAGE ATTACHMENT PORLATHES, &0. v APPL-loulou FILED n UNITED STATESY PATENT OFFICE.

WILLIAM A. FARRAR, OF WHITMAN, MASSACHUSETTS.

MICRONIETER-GAGE ATTACHMENT FOR LATHES, &O.

y Specication of Letters Patent.

Patented Aug. 8, 1905.

Application tiled March 13, 1905. Serial No. 249,876.

To all whomz't may concern:

Be it known that I, WILLIAM A. FARRAR, a citizen of the United States,residing at Whitman, in the county of Plymouth and Commonwealth ofMassachusetts, have invented new and useful Improvements inMicrometer-Gage Attachments for Lathes, &c., of which the following is aspecification.

My invention relates to improvements in radius-micrometers. It isdesigned to be used in connection with lathes, milling-machines, &c.

In the drawings herewith accompanying and making a part of thisapplication, Figure l is a central vertical sectional view of myimproved device, taken on a line passing through the center of themicrometer and its holder; and Fig. 2 is an end view of the same.

Same letters of reference refer to like parts.

It consists of a suitable holder Afadapted to be supported in a lathe or other machine in any convenient way, as by means of sockets B, intowhich take the holding-points of a lathe. (Not shown.) At a convenientpoint in one side of the holder a recess C is formed, the bottom of therecess being substantially in line with the centering-sockets. Mountedin the holder in any convenient manner is a micrometer comprising ahollow supporting-case C and a spindle D, threaded at the top to engagea similar thread on the inside of the case C. The spindle projects downyWardly through the case and through a guiding-nut D, which screws intothe lower end of the case C, the whole being positioned so that thespindle D projects into the recess C. The holder A has anupwardly-extending tubular portion O, with one or more slits C therein.Said tubular portion is, surrounded by a-ring P, which is held in placeby a set-screw P passing through the ring and engaging the externalsurface of the tubular portion. An annular flange R on thesupporting-case C engages the upper edge of said tubu ar portion andlimits the downward movement of the supporting-case in the holder.

The structure per Se of the micrometer forms no part of my invention.

In operation the holder, with the micrometer attachment, is mountedbetween the holding-points of the lathe and the spindle adjustedrelative to the centering-points, so that the distance the spindleprojects below the centering-points will equal the desired diameter ofthe article to be turned. The cutter-head or milling-tool having beenadjusted to a position coincident with the end of the spindle, thecentering-holder is removed and the article to be worked is placed inposition.

My improved device is especially advantageous in lining up lathe-centersto bring them into parallelism with ways of the lathe, in determiningthe difference in height or detecting wear in lathe-bearings, in settinglathe-tools by micrometer measurement to turn or bore any requireddiameter, in lining up work on lathe-carriages, and generally in testingthe accuracy of machine-tools-such as lathes, milling-machines, uprightdrillingmachines, &c.

Having thus described my invention and its use, I claim* A device of thecharacter described comprising a holder having centering-sockets in theends thereof and a recess in the side intermediate the ends thereof incombination with a micrometer-gage mounted upon said holder at rightangles thereto, the spindle on the micrometer passing through the holderinto the recess therein.

In testimony whereof I have signed my name to this specification, inpresence of two subscribing witnesses, this 9th day of March,

WILLIAM A. FARRAR. In presence of- Gno. D. SoULE, FRANK W. BRYANT.

